Tag Archives: scsolver

Recent activities

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So, I have several things going on at the moment: I have just registered for my final exam for the class I’ve been taking since December. This class has certainly been an eye-opener, especially for someone like myself who’d been … Continue reading

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Duh!

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In my quest to improve the initial solution search algorithm I wrote for the bounded revised simplex, I had spent almost a whole day trying to understand what the heck I was trying to do there when I first wrote … Continue reading

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Current status

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First off, my coding activity on solver is progressing very slow these days. Mostly because, besides my day job as a software engineer, I’ve been taking a class at a nearby college since January, and its class work (homework and … Continue reading

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Solver binary (take 2)

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Eike informed me that the previous binary I posted was not deployable with a regular OO.o build due to binary incompatibility with gcc (or g++ rather). I compiled my last binary using gcc 4.0, and gcc 4.0 apparently introduces compatibility … Continue reading

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First scsolver binary package after ooo-build integration

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Since not everybody who wants to use my solver has a version of OO.o derived from ooo-build, I have made available a separate binary package that can be installed on a regular OO.o. There is no functionality change since the … Continue reading

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Boost fix

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I’ve finally tracked down the problem of my solver not solving ANY models after having been integrated into ooo-build. It was due to Boost uBlas’s matrix resize function not preserving element values when resized. In my development environment (FC4) I … Continue reading

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Update on what I’ve been up to these days

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I haven’t been active for this past month as I was a bit preoccupied with my personal life. First of all, I’m in the process of career transition, moving from working in natural science field into software engineering. As a … Continue reading

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New LU factorization in matrix inverse algorithm

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One of the things I wanted to do as a remedy to my simplex algorithm (refer to my last blog entry) was to switch to another algorithm for LU factorization which is used in my matrix inverse algorithm. The original … Continue reading

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Solver update (rev. 100)

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Uploaded a new snapshot (rev. 100) for public consumption. In this release I’ve modified the model building algorithm – the algorithm responsible for converting a model in the spreadsheet form into a form the backend optimization algorithm can digest – … Continue reading

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Problem in two phase initial solution search

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In testing Ludovic’s model, I’ve discovered a bug in my two-phase initial solution search routine. Better take a close look at this.

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